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A. METZELTHIN, ST. RUDOLPH, K. VON HAEFTEN, M. HAVENITH, Physical Chemistry II, Ruhr-University Bochum, 44780 Bochum, Germany.
We have investigated the coupling of collective excitations in helium droplets to the rotation of light rotors. If we use NO as a molecular dopant it is possible to suppress this coupling effectively thereby obtaing high resolution spectra of NO in helium droplets. We have been able to resolve the
- doubling and the hyperfine structure of the Q(0.5)
_\frac12 transition. Whereas the hyperfine structure remains unchanged compared to the gas phase, the
doubling is found to be considerably increased.